hi..Thanaks for the query.
From what you have described, it looks like a sun burn reaction to the over exposure to sunlight.This can present in the scalp
, scaling and some tenderness as well.You can apply a mild topical steroid
on the affected area once-twice per day for about 7 days. I would advise you to also apply a medicated moisturizer on the affected area as well , so that the dryness/ scaling is minimal.Please apply a sunblock positively as a part of your regular routine.
The small brown spots might be freckles/ lentigenes , which have unmasked due to UV exposure.It is difficult to comment on whether they will disappear or not without seeing them.however you can expectvthem to tighten if further UV stimuli is avoided.
Hope this helps..Take care!