The Effect of Most Antibiotics on Birth Control. A 2011 Harvard study4 looked at oral birth control failure rates between females who took antibiotics in the four weeks before conception and those who did not. The study included more than 43,000 females taking antibiotics and oral contraception simultaneously.
Myxoid cysts are common and are more common in women and the elderly. These lesions occur more frequently on the fingers than on the toes. The most common location for myxoid cysts is the fingers. They are usually found near the base of the nail, slightly off to one side or the other.
Arthritis is a progressive disease that often causes breakdown of joints in the fingers. Osteoarthritis and rheumatoid arthritis are the most common types of arthritis that affect the fingers. These conditions sometimes cause bumps -- cysts and nodes -- to form on the back of the fingers.