My next door neighbour is worried about her 3 year old daughter. She will pick at her nails and skin around them till they bleed. The mum has tried painting them, and keeping them filed. If the mums sees her doing it and tell her to stop she will hide and do it. The mum said tonight that she is worried about adhd. All I could suggest was having a word with her teacher at preschool. Anyone any ideas ?? Thanks.