This is likely cognate to the popular Welsh girls' name Carys. The name is also that of an island in the Inner Hebrides island group, Scotland; Cara Island lying just off the southern tip of the Isle of Gigha. In Turkey the word Kara means dark, which may or may not be related to the Gaelic Ciara of the same meaning.
MRSA boils are a physical symptom that manifests in the presence of methicillin-resistant Staphylococcus aureus (MRSA) infection. Considered a form of dermal staph infection, MRSA boils present as progressive skin sores that form a boil of contained infection, which without proper treatment can lead to abscess formation.
MRSA is a type of staph, so the symptoms of a MRSA infection and the symptoms of an infection due to other staph are often the same. Pimples, rashes, pus-filled boils, especially when warm, painful, red or swollen, can indicate a staph skin infection.