I can speak from the same experience on this sadly. I bought a Cobra cage a few weeks ago and my gf loved it. at First I only wore it for short moments during play. After about two week I experienced that I had several red patches of skin on my cockhead and the very thin first layer of skin was slightly peeling off. Not alarmed by it I thought it had to be from my head being exposed to the rougher texture of the cage/open design and it scrubbing in my pants.
Fast forward to last night, me and my gf had a long play session and at the end of the evening I was allowed to take the cage of. Well I can say the places that previously touched the cage where very very red and it hurt when I took the cage off. Wherever the cage has touched my skin it was inflamed and this morning I had large patches of inflammation over the skin of my penis and balls where the cage had been in touch with it.
Some searching of the symptoms of paraphenylenediamine (PPD) allergy responses notes exactly what you (nosaint) and I experienced:
- Red (painfull) inflamed skin
- Itching
- Blisters
- Peeling of skin
- Swelling of skin
- Infection of the lymphatic nodes
Symptoms can develop within 48 hours of being in contact with PPD and can last between several days to several months depending on the severity of the allergic response.
These are serieus complications and just like you. I did not expect to have an allergic response from this material since I own several black chastity cages and never had an allergic response to it before.
The chemical causing this is also used in alot of hair dye's etc. the fact that they state fewer than 1% having a response to it is not correct. According to research papers, about 7.1% of the general population is allergic to this compound.
So I will be without a cage for 2+ weeks till everything is healed and doesn't feel itchy/stingy anymore. I asked the creators from kink3d when they plan to release a hypoallergenic version of this cage (a non black dyed one

). And I hope that will be soon since my gf does totally love the design on these.
So if you tend to own/buy these cages, I would strongly advice to carefully test if you are allergic to PPD. If there is one place you don't want to feel stingy/itchy/on fire all the time, its your dick

.