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As this only shows up after a shower, I am thinking maybe your shower gel or shampoo could have a preservative in that you are reacting to. Methylisothiazolinone is one of the most common preservatives that is used in shampoos, shower gels, cleaning products, washing up liquid, fabric softener, wipes, make up, skin creams, etc. 10% of the population are allergic to it and it can bring out contact dermatitis and breathing problems. It comes from a family of preservatives called isothiazolinones. Anything with this preservative in is an irritant so check everything which could have this in and get a replacement without this in it. Look for natural and eco products if you can’t find anything else, they never have this in. I had a similar problem quite a few years ago from sun cream when I went on holiday and I got this horrible rash all over my body. Every now and then I still get products that have it in that I haven’t checked the ingredient list and I get a reaction. It is in things you wouldn’t expect like fairy liquid, Fairy fabric softener for sensitive skin, head and shoulders for itchy sensitive scalp! It is a joke!
i had something that looked very similar id get it on my forehead and hairline it was my shampoo and conditioner i have to use kids stuff now
Rosacea? Try looking online for lots of articles and medications. If it is Rosacea it is very common and you need to find a cream to calm it down, There are lots on the market.