Can be infection
Pseudomonas aeruginosa is a common cause of folliculitis, which might be what you are having.
It is commonly called "hot tub folliculitis
" but can be spread in swimming
pools, or even sometimes by shared diving suits. It is very important to keep tubs, pools, and shared water equipment clean on a regular basis.
*sometimes is eczema
, which is dry, sensitive skin, depends on type of rash
Answer assisted by Jin Packard, Medical Student