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Thanks for contacting the medical experts.
A small bump does not sound like Folliculitis decalvans. If there is some itching and / or crusting, then ringworn is a more likely possibility.
Tough to be sure without a direct examination,
I would recommend a dermatologist / physician consultation and then prescription strength anti fungal medicines topically if ringworm is considered to be a serious possibility,
Dr, Gupta, MD