I see two lines under my breast. Is that a double bubble?

If two parallel horizontal lines stand out more when the chest muscle is tensed, a double bubble is likely. The upper line is the original fold, the lower a new border. Ultrasound confirming implant position and capsule state also shows whether bottoming out coexists.

It has been a month and I see a line. Will it go away with time?

At one month the line often sharpens as swelling drains. Watch through 3 months and judge at 6. If an attachment structure is the cause, it is unlikely to improve on its own afterward.

Can the double-bubble risk be known before surgery?

Largely, yes. A short nipple-to-fold distance, a constricted lower part, or a tuberous shape carry higher risk. Setting a plan to create the new fold and limit the implant diameter from the start prevents most.

Can an existing double bubble be corrected?

Most correct once the cause is identified. When the old fold was originally high, the direction is to erase the old fold; when the pocket dropped too far, to preserve the old fold and raise the pocket. Reversing them can worsen it, so diagnosis comes first.

How is a double bubble different from bottoming out?

Bottoming out is the implant dropping below the fold so the nipple-to-fold distance lengthens; a double bubble is the old fold mark remaining as a line above the dropped implant. They can coexist but are diagnosed separately because the correction differs.

Revision Surgery

Double Bubble Deformity: Cause and Correction

UNE Plastic Surgery · Dr. Kim Uigeon, board-certified plastic surgeon · Published 2026-09-21 · Updated 2026-09-21

After augmentation, some see two parallel horizontal lines under the breast. The upper line is the original inframammary fold; the lower is a new border formed as the implant dropped. This is called a double bubble. To answer first: a double bubble does not resolve on its own over time. It often shows less right after surgery from swelling, then stands out more around 3 months as the swelling drains and the implant settles — because the structure of skin and fascia attached at the old fold remains, and waiting does not release that attachment. Not every double bubble needs revision, though: the correction runs in opposite directions by cause, and those with a risk condition can prevent it at the first surgery. This article covers what it is, the anatomy of the fold, why it occurs, whether time resolves it, why correction splits two ways, and what is measured before surgery. Every clinical figure is linked to a cited study.

1. The condition called double bubble

Two horizontal curves appear under the breast: the upper is the original fold, the lower is where the dissection reached or a new border made as the implant dropped. The two lines run in parallel, giving the name.

Raising the arm or tensing the chest muscle makes the two lines stand out more.
It often shows less lying down than standing.
Clothing hides it, but it is immediately visible once underwear is off — a reason for a revision consultation.

It is easily confused with bottoming out but is a different state. Bottoming out is the implant dropping below the fold so the nipple-to-fold distance lengthens; a double bubble is the mark of the old fold remaining as a line above the dropped implant. The two can coexist, but the cause and correction differ.

2. The anatomy of the fold: a fascial attachment, not a ligament

To understand a double bubble, you first need to know how the fold is formed. For a long time a ligament supporting the breast was said to sit at the fold. But a study re-examined this structure histologically (Muntan et al., Plastic and Reconstructive Surgery, 2000).^[2] Removing the whole anterior chest wall of 12 cadavers (10 female, 2 male) and cutting the fold in cross-section under a microscope, none of the 12 had dense connective tissue that could be called a ligament. Instead, a superficial and a deep fascia layered in front of the pectoralis, and collagen bundles from the superficial fascia attached to the dermis at the fold; in some specimens the deep fascia also merged there with the superficial fascia and dermis. These bundles were seen consistently from the sternum to the axillary line, separate from Cooper’s ligaments within the breast tissue. So the fold is not a single ligament but a network of the superficial fascia attaching to the dermis. If this attachment remains, the skin stays held at the old site as a line even when the implant drops below it. This is the starting point of a double bubble.

3. Three cases where a double bubble occurs

Papers on the double bubble alone are rare, but a review organized the relationship between fold anatomy and the deformity (Handel, Plastic and Reconstructive Surgery, 2013).^[1] The author put the key to understanding cause and correction in the fold’s anatomy: since the fold is a superficial fascia attaching to the dermis rather than a ligament, if this attachment is not released enough and the implant drops below it, the old line remains — and even placing under the muscle with the lower part detached does not help if this attachment remains. Three cases seen in practice:

The pocket over-dissected below the fold: the old fold is left as it was and a new space made below it, so both borders remain.
The implant base wider than the breast base: with too little room, the implant is pushed down and the old fold catches over it — a size-choice problem.
An anatomical condition: a tuberous breast constricted below, a short nipple-to-fold distance, or a narrow lower breast have a strong, high fold attachment. Placing an implant fills volume below it, so the old fold readily remains as a line. Someone whose gland shrank a lot after childbirth, or with glandular-only ptosis, belongs here too.

It can happen even without a risk condition. Still, the third group is the most common, and it can be known before surgery.

4. Does it resolve over time?

The most common question. The answer: if an attachment structure is the cause, it does not resolve on its own — the site where skin is attached to the fascia does not detach by waiting. But how much it shows changes by period:

First month after surgery: swelling fills the lower groove so it shows little — too early to be reassured by not seeing it.
Month 1 to 3: as swelling drains and the implant settles, the line sharpens — when most double-bubble consultations come.
Month 3 to 6: the tissue stabilizes; a line remaining then is unlikely to improve on its own afterward.

The first few months are watched, and photos are compared to decide on correction. A mild degree can show less as the tissue over the muscle settles, but two clear lines on muscle tension will not be solved by time. In the interim, wearing a band that presses below to lift the implant upward is about all that can be done — and even that helps in some causes and not others.

5. Why correction splits two ways

Even looking the same as two lines, opposite causes are corrected in opposite directions. The review author organized that correction differs by whether an anatomical risk condition existed before surgery — so diagnosis comes first.

When the old fold was originally high

Someone with a risk condition — tuberous breast, short nipple-to-fold distance, narrow lower pole. The new lower border is at the right position, and the old fold is the problem, so the direction is to erase the old fold:

Fully release the attachment between the dermis and the superficial fascia — miss this layer and the line returns.
Release tissue radially from inside so the lower skin flattens.
If tissue is thin, switch to a dual plane that detaches the muscle widely to soften the lower cover.
If lower volume is short, fill with a shaped (teardrop) implant that holds its form.
After surgery, wrap an elastic band on the upper breast so the skin flattens downward; the wearing period is guided by progress.

When the old fold was normal but the pocket dropped

Someone without a risk condition whose dissection was excessive or whose implant descended naturally. The direction is the reverse — preserve the old fold and return the pocket upward:

Close the downward-widened pocket with a capsulorrhaphy to raise the floor the implant rests on.
If a submuscular implant keeps being pushed by muscle contraction, change the plane.
Join the front and back capsule to erase the old space and make a new pocket in front of it.
If tissue is very thin or a prior correction failed, reinforce the lower part with acellular dermal matrix to reduce recurrence.

Using the same method in both cases can worsen the deformity. So a revision consultation looks together at the old fold’s position, the plane the implant sits in, and the lower tissue thickness. Pin down the cause accurately and most correct.

6. Prevention: set at preoperative measurement

A double bubble is far easier to prevent than to fix, because the risk condition shows on measurement at consultation. Four items are checked:

Nipple-to-fold distance: if short, the fold must be set lower anew, and handling the old fold matters more.
Breast base width: the upper limit of implant diameter; an implant wider than the base is pushed down.
Lower skin’s give and thickness: measured by pinch; if thin, the plane is changed and the size reduced.
Fold shape: a constricted lower part is read as tuberous-type and planned separately.

When these conditions show, they are stated before surgery, and where to set the new fold, how far to release the old fold’s attachment, and what to limit the implant diameter to are decided in advance. At insertion, the new fold position is fixed first and dissection goes only to that line, releasing the old fold’s attachment under direct vision. This greatly reduces double bubble even in those with a risk condition.

Summary

A double bubble does not resolve on its own. It arises because the structure of skin and superficial fascia attached at the old fold remains, so it stands out more around 3 months as swelling drains.
Correction runs two ways. When the old fold was originally high, erase the old fold; when the pocket dropped, preserve the old fold and raise the pocket. The same method can worsen it.
Prevention is far easier. Measuring nipple-to-fold distance, base width, lower skin thickness, and fold shape before surgery reveals the risk condition, and the new fold position and implant diameter can be set in advance to block it.

References

Handel N. The double-bubble deformity: cause, prevention, and treatment. Plast Reconstr Surg. 2013;132(6):1434–1443. doi:10.1097/PRS.0b013e3182a805a6. (Review; correction differs by presence of a risk condition.)
Muntan CD, Sundine MJ, Rink RD, Acland RD. Inframammary fold: a histologic reappraisal. Plast Reconstr Surg. 2000;105(2):549–556. doi:10.1097/00006534-200002000-00011. (12 cadavers; no ligament; superficial fascia attaching to the dermis.)

Medical disclaimer. This article is general information and does not constitute medical diagnosis or treatment advice. Results vary with individual tissue condition and body type; accurate diagnosis and surgical planning are determined through in-person consultation with a board-certified plastic surgeon.

Dr. Kim Uigeon (Board-certified plastic surgeon, Republic of Korea · UNE Plastic Surgery)