Harry drank his dose, and immediately wished he hadn't. The potion tasted like incredibly thick snot, yet he felt like it was stinging his throat on the way down. He gagged and reached for a glass of water the nurse offered him. After a moment, though, the pain in his side faded, and he watched as the boils on his arm first seemed to deflate, then tighten to the normal shape of his arm, and finally fade from an angry red to match the rest of his skin.