Control group will attend their routine melanoma follow-ups

The intervention group will use the ASICA app in addition to their routine follow-ups

Participants in the intervention arm will be trained to use ASICA (in addition to completing routine follow-up) and participants within the control arm will continue to attend their usual structured melanoma follow-up only. The hypothesis is that the ASICA intervention will increase TSSE practice in those affected by melanoma without affecting psychological well-being and lead to earlier detection of recurrent and new primary melanoma.

This outcome will be measured using Melanoma Worry Scale (MWS). The scale consists of four questions asking the patients how worried they are about getting melanoma and how this impacts their current lifestyle. The patients choose the answers on a 5-point scale ranging from 'not at all worried' (best answer) to 'worried almost all the time' (worst answer).

This outcome will be measured using Hospital Anxiety and Depression Scale (HADS). HADS was devised to measure anxiety and depression in a general medical population of patients. The questionnaire comprises seven questions for anxiety and seven questions for depression. The patients choose the answers on a 4-point scale ranging from 'not at all' (best answer) to 'all the time' (worst answer). Each item on the questionnaire is scored from 0-3 leading to a score range of 0 and 21 for each subscales (anxiety or depression). For both scales, scores of less than 7 indicate non-cases, scores of 8-10 indicate mild anxiety/depression, scores of 11-14 indicate moderate anxiety/depression, and scores of 15-21 indicate severe anxiety/depression.

This outcome will be measured using EQ-5D-5L questionnaire. EQ-5D-5L consists of two sections - descriptive system and a visual scale. The descriptive system comprises of five questions about mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each question has five possible answers ranging from: no problems, slight problems, moderate problems, severe problems and extreme problems. The patient chooses the most appropriate statement in each of the five questions. This decision results in a 1-digit number that expresses the level selected for that question. The digits for the five dimensions can be combined into a 5-digit number that describes the patient's health state. The higher the number the worse the health state is. The visual scale records the patient's self-rated health on a vertical visual analogue scale, where the endpoints are labelled 'The worst health you can imagine' (score of 0) and 'The best health you can imagine' (score of 100).

The questionnaire consists of 14 questions asking patients whether they have ever and in the past 12 month checked any part of their skin for signs of skin cancer (yes/no answer). If so, how often (5 point scale ranging from 'zero' to 'more than six times') and which areas of the body were checked. The patients are also asked whether they used a mirror or get help to check difficult to reach areas of their body. The patients are also asked how confident they are about being able to check their own skin. Patients choose the answers on a 10-point scale ranging from 'not at all confident' (worst answer) to 'highly confident' (best answer). The final set of questions ask patients whether they have found anything concerning during their last skin check (yes/no answer) and if so what action was taken by the patient (watched it/showed it to a relative/showed it to a professional) and how quickly (immediately, in few days, in a week, in a month, other).