In reply to BenFirth:
Hi Ben,
I have a very similar thing, and get it on a similar basis - 2/3 times a year for a month or so at a time. In fact, it's flaring up quite badly at the moment, as it seems to most summers - I guess due to a mixture of climbing quite a bit and hot weather. For me it feels worse at times of stress, but that's just my own theorising. It used to get sore (bleeding at folds of digits) but thankfully isn't often painful anymore and has calmed down a lot in recent years as I've got a bit older.
The main things for me are trying to ensure my hands don't stay wet or warm for long spells (bath, gloves etc), wash any chalk off quickly after climbing (if you use it at all), and use lots and lots of Epaderm. I'm sure other creams work too, but I haven't personally found a better one. Dermol was okay, but I prefer the former. I sometimes even bring it to the crag so you can put it on the second you stop before the skin dries out, and definitely bring it away on long trips. If you live in Scotland, you'll get it for free on repeat prescription and it can be used as a soap substitute. Maybe also try thinking about how to cut down stress with pilates, mindfulness, workplace changes?
I've never tried diet changes, but think I eat fairly carefully already. Maybe I should try cutting back on milk a bit.
I've had this on and off for a decade or so, and it is gradually, slowly improving, so my advice would be to keep trying everything but try not to worry too much if nothing is helping (I guess that's easier said than done if painful or making climbing unenjoyable) as eventually it may just go away on it's own due to changes you don't even realise you're making. For example, mine's improved since I recently changed jobs and swapped a tiring, stressful commute for a nice cycle to/from work.
Anyway, good luck.
D.
Post edited at 15:56