Hi , I'm so glad you reached out. It definitely is possible to have PsA with mild skin symptoms. In fact, it's even possible to have PsA without any skin symptoms (although that is less common). We are not doctors and cannot say for sure what it is you are experiencing, but it doesn't hurt to see a doctor (whether that be a general practitioner, dermatologist, or rheumatologist that might depend on your insurance and/or what doctors are available or if they require a referral) to investigate what is causing your symptoms.
I am including a link to an article with more information on psoriatic arthritis also, https://psoriatic-arthritis.com/psa-basics. One thing I also do want to point out is that it is possible to have RA and test negative. This is called seronegative RA. Here's a link to an article with information on this as well, https://rheumatoidarthritis.net/seronegative-diagnosis. When you were tested, was it by a rheumatologist or a general practitioner? It might be worth going directly to the rheumatologist (if your doctor and insurance will allow) if you've already tried getting answers from your general practitioner.
I do hope that you can get some answers and, if you're comfortable, please let us know what the doctor determines! -- Warmly, Christine (Team Member)