Willy Wonka’s Violet Beauregarde could start a support group. According to a case report in the New England Journal of Medicine , a 68-year-old woman developed “blue-gray hyperpigmentation” on her limbs just a couple of weeks after she started taking a common medication. The woman sought treatment after dark patches on her arms and legs persisted for six weeks. Prior to the dark development, the woman, who suffers from rosacea, a common skin condition that causes the face to appear red or flushed, began taking 100 mg daily of oral minocycline. The woman suffers from rosacea, a common skin condition that causes the face to appear red or flushed — and wasn’t the cause of the blue hue. “Rosacea is a chronic inflammatory condition in which the skin appears inflamed along with evidence of acne-like bumps and textural change,” dermatologist  Alicia Zalka previously told The Post.…