Skin tags are growths that usually occur after midlife; they are not contagious. Genital warts are caused by a virus and are contagious. Neither skin tags nor genital warts become cancerous.

Skin that has been burned becomes red, and blisters may form in the case of a second- or third-degree burn, says the Mayo Clinic. Third-degree burns are the most severe burns and may be accompanied by black or white, charred areas of the skin. If you are suffering from third-degree burns, see a doctor immediately.

The pH of a liquid determines its acidity. By measuring how many protons, or hydrogen atoms, a chemical releases into a solution, you can determine how acidic the solution is. Acidity is measured on a pH scale, ranging from 0—highly acidic—to 14—highly alkaline or basic. Pure water is neutral, with a pH of 7.

Saw palmetto is the most popular herbal hair loss treatment, although it does not have the approval of the U.S. Food and Drug Administration or large-scale scientific studies to back its use for hair loss.

Vitamin B-12 is a water-soluble vitamin belonging to the B-complex family of vitamins. Many important biological processes in your body, including red blood cell formation and nervous system function, require vitamin B-12.

Cranberry is an evergreen berry shrub native to North America. This berry plant is used for treating bladder and kidney disease, yeast infection and helicobacter pylori infections resulting in gastrointestinal ulcers and dental plagues. An allergic reaction to cranberry is rare but possible.

Metformin is a prescription medication used in the treatment of Type 2 diabetes. Metformin can be taken alone or in conjunction with other medications, such as insulin. It is important to eat a healthy diet.

Dry, cracked feet are not only hard to look at, they can cause health problems, too. Dry skin is painful and itchy, and it can allow diseases to enter the body through tiny cracks. You may see thick areas of skin on your feet, called calluses, if you wear shoes without socks or go barefoot often.

Although razor bumps affect every skin type, two characteristics may make them more of a troubling issue for women of black ethnicity. First, the individual hairs may be thick and densely curled, making it more likely that they will get caught beneath the skin’s surface.

Cold sores are embarrassing bumps around the mouth, which many people get from time to time. According to the website Whole Health MD, the true cause of cold sores is the herpes simplex virus, which can lie dormant in a person's body for years.

Keratosis pilaris is a common, benign skin condition that causes small, painless bumps and rough patches, usually on your arms, thighs and buttocks. Often referred to as "chicken skin," keratosis pilaris is noncontagious. MayoClinic.

Stretch marks, also known as "striae," are discolored streaks or indentations of the skin on the abdomen, breasts, buttocks, arms, legs and thighs. Often, they appear in the third trimester of pregnancy, but can be associated with other medical conditions.