

Should I See a Doctor / Dermatologist for a Dark Mark Left by a Rash?
About three weeks ago, I went to visit family in Kentucky. It was pretty hot and humid outside, and I was helping in the garden. There were a lot of mosquitoes, so I grabbed a hoodie from my bag to protect my neck. I took a shower afterward.
About 3 or 4 days later, I got a haircut, and my barber pointed out that I had a rash on the back of my neck. It was itchy at the time. Fast forward to today (about three weeks later), I got another haircut, and he mentioned that there's now a dark circle or dark patch where the rash was.
I honestly forgot about it because it doesn't itch anymore. I've attached a before and after picture for reference.
Do you think I should see a dermatologist or my primary care doctor? Or is this something I could try treating with an over-the-counter product like Mederma Advanced Scar Gel or something similar?
Also, if you think I should see a doctor, is there anything I should avoid doing until Monday? For example, using certain creams, working out, being out in the sun, or anything else?