Cyst on the Scalp Getting Bigger: What to Know

Pilar cysts develop from cells associated with hair follicles and commonly feel smooth and firm beneath the scalp. Enlargement can happen gradually as material collects inside the sac. A knock, pressure from headwear, or friction while brushing may make it sore or inflamed. Growth does not identify the cause by itself; a clinician checks the surface, mobility, tenderness, and nearby scalp.

Take note of when you first noticed it, whether the skin has changed, and whether its size or tenderness varies. Avoid picking, puncturing, or trying to flatten it. Use a soft brush and avoid pressure from tight headwear if those worsen discomfort. Arrange a dermatology visit because an enlarging lump may be easier to manage before it becomes inflamed. If it is repeatedly caught during grooming or is uncomfortable, ask about Cyst Removal.

Seek prompt care if enlargement is rapid or accompanied by heat, redness, marked tenderness, pus, bleeding, fever, or redness spreading across the scalp. Urgent assessment is appropriate for severe pain, swelling around the eye, or feeling very unwell. A firm lump that is fixed, ulcerated, or changing in an unusual way also needs timely review.

Ask whether the lump has the features of a pilar cyst, whether it is inflamed, and whether any examination beyond looking and feeling it is needed. Discuss observation versus removal, how the scalp will be cared for afterward, and what symptoms should trigger earlier review.