Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Credit: Discharging boil, parotid gland area (sheep). Royal Veterinary College. Source: Wellcome Collection.

Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Credit: Discharging boil, parotid gland area (sheep). Royal Veterinary College. Source: Wellcome Collection.