I suddenly have painful sores along the tip of my tongue. Any advice?

Tongue sore. Impossible to answer without history/exam. If ulcers treated one way;rash treated another. A biopsy may be needed. Can be aphthous ulcers (canker sores), geographic tongue;tongue biting;yeast;allergy. Tip of tongue often from rubbing tongue over teeth. This can cause pain/burning. Teeth may need to be smoothed, habit broken. Check with your dentist or a specialist in oral diagnosis/oral medicine/oral path.
Yes. Set up an appointment with a dentist to have him\her examine you to determine the cause and suggest appropriate treatment, if necessary.