It might be nearly impossible, but it's important to ignore a zit and let it heal on its own. But there is one big exception: Ingrown hair, the painful cousin to the harmless, yet pesky pimple.

Several conditions can cause bumps on the hand, including eczema, ingrown hairs, insect bites, and more. Treatment may depend on the cause. An acne pimple develops when an oil gland becomes ...