After a recent PCT hike (30 miles in two days) I noticed “blood blisters” under the nails of the second and third toes of my left foot. They don’t hurt; I would not know they’re there except for seeing them. Do they indicate my shoes don’t fit, or something else? I’m about to buy a new pair (have my eye on Merrell Moab Ventilators) and I’m wondering if I need to size up.
Background info:
Current Shoes: Merrell Radius Size 10 (fit feels good but they’re hot, all leather)
Socks: Smartwool Outdoor Light Mini (Large)
Size: Brannock Device for my feet: Left 9.5, Right 9.25 (a pre-hike measurement)
Me: Not a high mileage guy, not a through-hiker. A 15-mi day is a lot for me.
Feet: All nails were closely trimmed.
Terrain on this hike: Up and down. Not much level.
Baseweight of pack: 12-13 lbs.
Note: My left foot’s a quarter size larger, and the blisters appeared on the left foot. Would that indicate my current shoes are undersize?

