Cold" and "flu" are both terms used to describe respiratory illnesses caused by viruses, but they are caused by different viruses and have some differing symptoms and severity.

Scabies is a contagious skin infestation caused by the microscopic mite Sarcoptes scabiei. These mites burrow into the top layer of the skin, where they lay eggs and cause intense itching.

Muscular dystrophy (MD) refers to a group of genetic diseases that cause progressive weakness and degeneration of skeletal muscles.

Acne is a common skin condition that occurs when hair follicles become clogged with oil and dead skin cells. It often manifests as pimples, blackheads, whiteheads, or cysts, typically appearing .