This is in response to the enquiry: “When skin stays indented, is this a sign of infection?”
Indentation of the skin occurs when one presses on the skin. That indicates edema under the skin. Edema is not infection.
When there is a blister and pus inside the blister and the skin stays indented when pressed, that means the pus has been pushed aside. The pus and blister are the manifestation of an infection. The indentation of the skin is the result of pressing on the blister or the boil, and by itself, does not indicate infection. It is the blister and the boil that indicate infection.
If one sees an indentation of the muscles, it indicates a dislocation of a muscle group. If one feels an indentation on the spinal cord, it indicates disc herniation.