Sebaceous cyst on a stretch mark: what to know

Stretch marks are areas where the skin has changed in texture and colour. A separate rounded lump in or beside one can still be an epidermoid cyst, which is a keratin-filled sac beneath the skin. Other possibilities include an inflamed follicle, scar-related change or an abscess. A clinician assesses whether the lump is superficial, mobile, tender, attached to deeper tissue or changing over time.

The stretch mark itself does not prove that a cyst is present. Note when the lump appeared, whether it follows friction or shaving, and whether its size, colour or tenderness changes. You can also read about [Skin Lumps](/symptoms/skin-lumps/) before an appointment.

Avoid squeezing, needling or vigorous massage over the area. Reduce rubbing from tight clothing, keep the skin clean and use a bland moisturiser if the stretch mark feels dry. Do not apply strong acids or leftover medicines to a lump without professional advice.

If it is small and quiet, monitoring may be suitable after a clinician confirms what it is. A persistent or bothersome cyst may be treated with [Cyst Removal](/treatments/surgical-dermatology/cyst-removal/). If it is inflamed, the clinician may discuss [Steroid Injection Into The Skin](/treatments/injectables/intralesional-steroid-injection/) or wait until inflammation settles before removal.

Arrange prompt assessment for rapid growth, increasing warmth, redness, pain, pus, fever or redness spreading beyond the stretch mark. A clinician may consider [Abscess Drainage](/treatments/minor-procedures/abscess-drainage/) when infection has formed. Seek urgent help for severe pain, rapidly worsening swelling or feeling very unwell. Any lump that bleeds, ulcerates, becomes fixed or continues changing should be examined.

Is the lump separate from the stretch mark? Could it be a cyst, scar change or abscess? Would treatment alter the stretch-mark texture, and what care would help the area heal?