depende na siya bro...when you say rashes...you mean red small spots? if yes, then heat rash siguro na...direct sunlight ba siya? ayaw ibulad sa init...
and you may try almitraz soap...rinse the soap after 3 days...but make sure na you take out the sediments of the soap para dili niya tilapan...
but it would be better if you take some pix para maklaro pud unsa na nga rashes imong pasabot...