A year ago I had the same problem with my neck and my face. I thought it was some allergic reaction to the food I ate or something. I bought a lot of pills to get rid of the allergy that I thought it was but unfortunately it didn't work. One of my friends advised me to go to a dermatologist for some skin treatments. I've found a great site
https://cliniccleo.com/ of skin clinic and called there for a consultation. After the consultation, I went to the clinic where I made a hydrating treatment, dermal fillers, and hydro dermabrasion. It helped me a lot, it improved and revitalized my skin. Now I make those treatments twice a year and I'm very happy.