Bangkok's first and most popular onsen, Yunomori, has welcomed winter with a "limited-edition" new bath. 

Available now through Jan 19, 2017, the yuzu yu (yuzu bath) reportedly boasts the healing qualities of its namesake Japanese citrus fruit (a kind of cross between a lemon and a mandarin). 

It's been introduced to coincide with the winter solstice (Dec 22), a time when many Japanese people believe that bathing in a hot yuzu bath will repel winter diseases.

Available for both men and women, the cloudy-textured yuzu bath is said to be particularly good for rejuvenating and softening maturing skin owing to the hight level of citric acid and vitamin C, as well as guarding against colds, improving circulation and relieving muscular aches. 

Unlimited onsen remains B450 per person, but go on Tue or Wed and it's come-two-pay-one (through Mar 8, 2017).

A Square, Sukhumvit Soi 26, 02-259-5778