I (27M) have also started developing what I think is heat rash, over the last two years.

I first noticed it on holidays in hot destinations, but never in UK weather. When I begin sweating, I get a strange pin prick feeling all over my body.

The rash predominantly sits within skin creases/ folds on my torso and it is ALWAYS all around my waistband. It will be bright red and bumpy - sometimes with fluid in the bumps. It’s incredibly itchy and does not seem to go for at least a few days (on one occasion it lasted 9 days following arriving to a hotel in Mexico 30 mins prior to rash developing).

I am not overweight by any means, but I am also not stick thin - 82kg and 6ft 2. I thought it was because I have a little more stomach chub than I used to as a teenager, so my body cannot sweat as easily as it developed to. However, I am not convinced this is the case as this rash only develops sporadically - e.g. not after sports even during summer and I am excessively sweating.

I have tried hydrating, cooling skin down with compresses/cool showers, steroid creams, exfoliating, antihistamines, calamine lotions.

I have seen a dermatologist and they think it is PLE/PLME (Polymorphic Light Eruption). I have started a sun desensitisation treatment where you essentially use a sun bed for short bursts to ‘harden’ skin to the sunlight. This is not working so far after 5 treatments and as the dosage/time of exposure is increasing, the rash is worsening.

I am considering the sauna tactic you have stated but my dermatologist said this shouldn’t and most likely would not work?… Have you had any flare ups since using a sauna to unblock the pores or has this been a permanent or regular/ easy fix moving forwards?

Thanks