This is Dr Basu, Experienced Specialist.
I am here to address your concerns and provide great service.
This rash can be an allergic reaction to the chlorine or something else in the swimming pool.
This can be treated with a potent steroid cream like desonide gel which requires prescription.
Over the counter hydrocortisone is weak steroid cream which may be used meanwhile twice daily.
Another possibility can be cellulitis or skin infection from the bacteria.
Usually the rash will be painful and swollen.
So that is unlikely.
The excessive sleepiness, weight gain can be due to the metabolic disorders like diabetes, hypothyroidism
, Cushing's syndrome.
Hence, he needs a thorough evaluation by an internist as well.
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