Hello, I'm posting this as a dermatologist. I just saw a young girl with an eczema like rash on her thighs that she thinks got started from sitting on a cement barrier in a pool that has several areas that look like there is "black algae".
There are several other explanations for her rash, but I was curious whether anyone out there has seen these types of algae cause skin infections in humans? I'm doubtful that they can. However, I'm also pretty certain that if i swabbed the area and sent it to the microbiology lab, it is horribly unlikely that they'd be able to culture and grow any of these organisms, so infection may be challenging to prove.
There are several other explanations for her rash, but I was curious whether anyone out there has seen these types of algae cause skin infections in humans? I'm doubtful that they can. However, I'm also pretty certain that if i swabbed the area and sent it to the microbiology lab, it is horribly unlikely that they'd be able to culture and grow any of these organisms, so infection may be challenging to prove.