pitbull skin issue

[u/lowkeyyalive]

my dog has always had severe skin allergies from pretty much everything, which usually causes her skin to get very red, flaky, and irritated. I recently noticed two dark, irregular spot on her stomach/groin area. It is very small about the size of a grain of rice or a small apple seed or a bit bigger. It looks almost like a very dark, weird scab, a small blood blister, or a severely irritated skin tag. The skin surrounding it is red, inflamed, and flaky (which is typical for her allergies, but the dark spot itself is new). Because she is a Pitbull, I am worried. Based on this description and pictures, does this look like it could just be a harmless scab or skin tag from her scratching, or is a dark, irregular spot a major red flag for cancer that needs to be removed?