Milia in scar tissue means more

Small white dots in a healing wound are a marker of a scarring disorder in the skin.

These are milia, or trapped retention cysts of keratin.

If a patient has a blistering disorder and the blister heals with milia like this, then it suggests an underlying subepidermal blistering disease such as porphyria cutanea tarda or epidermolysis bullosa acquisita or a blistering fixed drug reaction.

Hence the presence of simple milia within a scar can help you diagnose more serious disorders. Milia are commonly seen as isolated lesions in the skin, especially on the face, and at all ages.