1. A polypeptide for use in the treatment and / or prevention of a fungal infection caused by Malassezia spp. And / or a condition associated with Malassezia spp., Containing a sequence of about 25-200 amino acids, where essentially all amino acids in this sequence are lysine. 2. The polypeptide according to claim 1, containing a sequence of lysine residues continuously following each other. A polypeptide according to claim 1, comprising a sequence of about 38-189 lysine residues, preferably 50-150 lysine residues, for example 50-125 lysine residues. The polypeptide according to claim 1, which is a polylysine. 5. The polypeptide according to any one of paragraphs. 1-4, where the fungal infection or condition associated with Malassezia spp. Is selected from the group consisting of one or more of: dermatitis (eg, seborrheic dermatitis or atopic dermatitis), dandruff, pityriasis / multicolor versicolor, folliculitis with pityriasis / herpes zoster , folliculitis caused by Malassezia, acne vulgaris, dacryocystitis, seborrheic blepharitis, otitis externa, drainage and net papillomatosis, nodular hair infection, psoriasis, mastitis, sinusitis, septic arthritis, peritonitis, neonatal pustules and for catheter-related fungemii.6. The polypeptide according to any one of paragraphs. 1-4, where a fungal infection or condition associated with Malassezia spp. Occurs in humans or animals. The polypeptide according to any one of paragraphs. 1-4, where the fungal infection is caused or the condition associated with Malassezia spp. Is associated with a fungal pathogen selected from Malassezia furfur, Malassezia pachydermatis, Malassezia globosa, Malassezia obtuse, Malassezia restricta, Malassezia slooffiae symis, Malassezia slooffiae symisialis, Malassezia slooffiae symisis, Malassezia slooffiae symisis, Malassezia slooffiae symis, Malassezia slooffiae symis, Malassezia suloffiae malisse malasse, Malassezia spp. .japonica, M.nana and M.yamatoensis, preferably a fungal pathogen selec
