I have been dealing with Morton's Neuroma (MN) for 8 years now, and I am the founder of MN Talk (check out my signature). I am NOT a doctor, but I do have a lot of experience and knowledge in this area. Of course, consult a doctor for diagnosis and treatment.
Going off your description of the location and pain from your other thread, having a "Morton's Neuroma" develop between the big toe and the second toe is very, very rare, if you are thinking MN. Also, with MN, you don't see visible swelling. With MN, walking on the tippie toes may or may not produce pain, and squeezing the toes together (Mulder's Click test) or pressing on the general area may or may not produce pain.
MN is the build-up of scar tissue around the nerve sheath. The number one cause of MN is the types of shoes we wear. Shoes that are tight in the toe box can cause compression on the nerves that run between the metatarsals. Shoes that have an elevated heel, even athletic shoes' heel-height, will cause you to place your weight over your forefoot exacerbating the compression.
Looking at your pictures from the other thread, you clearly do not have a "genetically short first toe," since your second toe is shorter than your first, so you can rule out anything that has to do with Morton's Toe (MT). I don't know why that was brought up to you in your other thread. Morton's Toe and Morton's Neuroma are unrelated. Both were named after two different men named "Morton" (although in the case of MN, the condition is completely misclassified and misnamed. Morton's Neuroma is not a true neuroma (tumor); it's a perineural fibroma (fibrous tissue formation around nerve tissue) and was first correctly described by a chiropodist named Durlacher). People can have one without ever having the other.
Have you thought about complete RICE (rest, ice, compression, and elevation) for a good amount of time before seeing a doctor to reduce the amount of causability, or inaccurate diagnoses?