The back of my left forearm has developed a number of irregular red spots about 5mm to 1cm in size. They're slightly raised as if inflammed but do not itch. They appear rapidly, persist for a few days then gradually fade before another one appears in a different location. Sometimes they develop a white head almost like acne. Most of them appear to be centred around a hair follicle. They mainly appear on the tanned skin on the back of the arm, very rarely on the paler inside of the arm. Very occasionally they appear on my right arm in the same general region.
The spots appeared a few weeks ago, I don't know if it related, but about the same time as the weather turned hot and humid. I had similar spots last summer and they appeared to disappear in the autumn. I do suffer from hayfever and take a daily anti-histamine to relieve those symptoms. I don't keep any pets.
I've tried using over-the-counter anti-spot formulations using benzoyl peroxide or with tea tree oil but noticed no improvement. I've also tried anti-histamine skin creams, they reduce the redness a little, but do not get rid of the spots, nor does it stop them reappearing. One pharmacist, who did not know what could be causing the spots, suggested antiseptic TCP to dry the spots out, but this doesn't seem to help.
I'm middle-aged, male and Causasian with no known medical conditions and I'm not on any prescription medications.
Anyone got any ideas? The spots don't hurt, but they are unsightly.
Thanks in advance.
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Is it sensitive skin or something else?