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Looks like you have developed multiple lesions of folliculitis
)over you scalp
Folliculitis is the inflammation of one or more hair follicles.
The condition may occur anywhere on the skin with the exception of the palms of the hands and soles of the feet.
They may appear as red dots firstly and then increase in size to become red , hot, tender pus filled lesions... Such lesions especially on the scalp are very painful.
Avoid touching the lesions too much.
Avoid using any kind of cold dreams or hair oils..as it might increase the lesion.
You can start using a topical antibiotic/antiseptic cream(like mupirocin
gel) over the lesion
Use a betadine
containing shampoo atleast twice a week inorder to prevent the recurrent development of such lesions
If it persists even after using the cream for 2-3 days, then you need to consult a skin specialist as lesions on the scalp are very painful and also they tend to increase in size very quickly...
Take some pain killers along for relieving the associated pain and discomfort
Hope it helps
Wishing you speedy recovery
Dr Geetika Paul