62 year old female. Reddened shins with some pin-point dark red spots. No swelling. Onset in one afternoon. History of cellulitis to the same area.

Rule out cellulitis. With your history of prior cellulits in the same area it is possible that this is recurring. Please seek the attention of your doctor promptly to rule out a return of the cellulitis.
Could be cellulitis. Typically cellulitis is tender and warm to touch. It may also be associated with swelling but not necessarily. Given your history, you are at higher risk for cellulitis. You should probably be evaluated by a physician in person, particularly if you have diabetes, note spreading redness, or develop a fever greater than 100.4F.