That sounds to me like you may have just gotten a blister. They come back a little crusty sometimes. I’d recommend going to the dermatologist, there are a lot of great ways to clear up acne with special medical care! There are also some helpful over the counter creams and medications. It doesn’t sound like any kind of skin condition, but you would be able to confirm or deny that if you went to the dermatologist. 
Hope that helped! :)
        
                    
             
        
        
        
<span>The common cold, the flu, food poisoning, and toothaches all stem from pathogens. Pathogens are infectious agent that causes disease or illness to its host. The term is often used for agents that disrupt the normal physiology of a multicellular plant or animal, like the human.</span>
        
                    
             
        
        
        
Huh What is this question bc I’m confused
        
             
        
        
        
Answer:
The basic lunge works the quads, glutes, and hamstrings.