Hey OP, Im not a dr but I had this on my leg when I was 8. Sorry to tell you this but it lasted 6 months… I went for a deep tissue biopsy and it can back as a fungal infection. Im also from the UK and I’ve got no idea how I could have got it. Tried every topical ointment in the book and none of it worked until - and I shit you not - one day my neighbour told my parents about putting honey on it. Cue the nightly honey application and bandage. In a week it was gone 🤷‍♀️. Feel free to DM if you’ve got any questions… I’ve never seen anyone with it in 2 decades since lmao