AITA for refusing to wear body makeup for my friends wedding?

My friend has just gotten engaged, and has asked me to be her maid of honour, I am beyond thrilled for her and beyond touched shes asked me but its on the condition I wear body makeup over my psoriasis. I cant do that, not only is it impractical, any make up that will actually cover it will exacerbate the condition and make life miserable for me.

To be clear, I have it well controlled, I am not flakey, the skin is simply very red. It covers 80% of one forearm, 20% on the other, both elbows and I have large patches on my calves knees and 90% of the top of one foot. I use gentle manual exfoliation and a moisturiser that helps control the dry and excess skin. I apply the moisturiser a couple of times a day, and wouldnt be able to do this while wearing makeup.

I let her know I wouldn’t be able to do that, explained why, even though she knows I have to be careful with all products I use, and ses quite unhappy with me. She wants “beautiful photographs that make everyone feel beautiful and confident”, which really upset me.

I am content and confident in my skin, I know its there and people stare sometimes but what can I do about that? Most people think ive had some kind of gnarly motorbike accident or something tbh. Im at a point in my life where I honestly dont care and often forget that its unusual to see.

I know the reason is because she doesnt want to see it in her photos, I said as much to her and she was offended. I suggested that I wear something with long sleeves and skirt, but shes already has her heart set on midi length strapless dresses, and a shawl covering “wont go”.

It got to the point where she was getting heated because I wont do it and told me I either wore the body make up or dont bother even coming. I ended up telling her either she has me as is or not at all and left. She is now not speaking to me, but has told her fiance that I accepted the role..?

Am I the asshole? Should I just suck it up wear the body makeup and deal with it? I love my friend and I would hate to miss her wedding, but wearing the body makeup would just make the night so miserable and cause so much irritation and possibly pain if it gets so bad my skin splits again..