(CNN) Hugh Jackman's defense against skin cancer continues as the actor posted his latest warning Monday about wearing sunscreen. With a bandage over his nose, the star checked in with his fans on Twitter and Instagram to reveal that he's undergoing treatment for basal cell carcinoma, again. Last year, he posted a photo to his Facebook page with a similar image of a bandage over his nose. His treatment for basal cell carcinoma dates back to 2013.