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Is it possibly ringworm which is a fungal infection?

This is from the NY State Dept. of Health website:

Ringworm of the scalp usually begins as a small pimple which becomes larger in size and leaves scaly patches of temporary baldness. Infected hairs become brittle and break off easily. Occasionally, yellowish cuplike crusty areas are seen.

Your doctor may prescribe a fungicidal material to swallow as tablets or powders that can be applied directly to the affected areas. Griseofulvin is commonly prescribed for treating fungus infections.

Hope you can get it figured out!