What is ingrown hair? what does it look like when someone's armpits? how to prevent it and remedy when it has already shown?

Hair has grown in: It is a hair that has grown in instead of out. It normally looks like a pimple (or collection of pimples) although can be bigger. It is more likely if you have thick or curly hair, and it often occurs after shaving. If in an area where you shave, use shaving cream, shave in the same direction. Most of the time it resolves on its own, but if it becomes infected you will need to see your doctor.