### Clue: What dermatologists may do when they occur without warning (4-6)
### Answer: SPOT CHECKS 
 ### Explanation: Definition: they occur without warning
  Cryptic defn: Dermatologists, skin specialists that they are, may check any spot on your epidermis to ensure that all is healthy. 
Answer: Spot checks by authorities of eg. identification, intoxication by drugs or alcohol, occur without warning.