Morton's neuroma is often caused by running and jogging, and treatment usually appears to be aimed at correcting the gait by the use of orthotics to relieve some of the pressures which are thought to cause the problem and then reducing the inflammation and pain by the use of medication. Although there is very little specific evidence for the use of acupuncture for this specific condition, acupuncture treatment is often used to reduce pain and inflammation in a number of conditions for which there is ample evidence, so it is within the bounds of what one might go to an acupuncturist for.
Traditional Chinese medicine has a different take on why and how such conditions are caused in the body, and a practitioner might well look at the overall balance to understand why this has arisen. In the majority of cases the cause is straightforward - over-exercise or poor alignment - and if acupuncture is successful in reducing the inflammation and pain there may well be some longer term management issues about how to balance continued running with treatment aimed at ensuring that the condition is kept under control. It may bne useful to involve a podiatrist or osteopath in the overall strategy.
If you do decide to go ahead with treatment we advise you to agree very specific outcomes with your practitioner and review progress on a regular basis. Conditions like these can be quite obstinate, and there is no point in having a long course of treatment if there is no change. For cases such as this there are surgical options which have a reasonably good success rate.