I have a recurrent white, boil-like lesion on my head that has been dry for the past 9-10 months. I tend to rub it while studying.
Rubbing can exacerbate a recurrent, dry, boil-like lesion on the scalp that could be a seborrheic dermatitis, cyst, or persistent infection. For an accurate diagnosis and treatment, which may involve topical or oral drugs, you should consult a dermatologist.