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Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
It is difficult to obtain enough calcium without consuming milk or other dairy foods.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.