Table 1.

The research questions.

Research Question	Motivation
RQ1: What are the features and advantages of recently developed DL(Deep learning) methods for skin cancer classification?	This question helps to know about different techniques which have been proposed recently and their features
RQ2: What data sets are used in skin cancer detection methods evaluations?	This question helps to know about the publicly available data set that can be used in future research as a benchmark
RQ3: What are future challenges reported by papers in this domain?	This question helps to know about the future challenges in this domain
REQ:4 What are the machine learning and deep learning approaches for skin cancer detection	This question helps to know about the different methods used to detect skin cancer