Please choose the correct ending to complete the given sentence: Health: [header] How to treat a rash on the neck [title] Evaluate your circumstances before the rash appeared. [step] Where you were and what you were doing before the onset of the rash can provide important clues as to what caused the rash. Think about anything new or unusual that you might have been exposed to.

Ending1: Find a reliable source for your observations and how you came to think of them. [substeps] In later years, ask about how the experience affected you, and where you were in that experience. Ending2: Consider if these changes were occurring because of the rash or if they are occurring due to stress. [title] Spot a rash which appears to have probably developed over time. Ending3: This could include, responding to a sudden lightning strike, or going outside for an extended period of time when there were no sparks to account for. [substeps] A headache, hot flashes, tingling in your neck, a rash that appears within 6 to 15 days after the time of day the rash appears, could be indicative of a sunburn. Ending4: [substeps] If you wore a new necklace for the first time, tried a new lotion or soap, or ate a new food, your rash may be an allergic reaction. Make note of how much time passed from the initial exposure until the development of the rash.

Answer format: ending1/ending2/ending3/ending4