The easiest way to use くすぐったい and かゆい
I’d say くすぐったい and かゆい are a little bit confusing, however, their nuance is different from each other and the rule of using these words is not so difficult to use, so let’s try to master here.
くすぐったい (kusuguttai)
Tickle
When feeling tickle, you could use くすぐったい. For example, your friends tickle you, your dog licks your sole and etc. Unlike かゆい, when someone stops tickling you, it would be gone. And some people use こしょばい or こそばい as the meaning of くすぐったい. They are the same meaning.
Example

やめてー!くすぐったい! (Ahhhh stop it!! It tickles!) (快住手!好痒呀!) (하지 마! 간지러워!) (Dừng lại đi! nhột à.)

友達をくすぐった。 (I tickled my friend.) (我骗了我的朋友们。) (친구를 간지럽혔다.) (Tôi cù bạn bè của tôi.)

それやめてくれる?すごいくすぐったいんだけどー。 (Can you stop that? It really tickles.) (可以停手吗——那非常痒啊。) (그거 그만 좀 할래? 너무 간지러운데.) (Dừng lại dùm đi! Buồn kinh khủng ý!)

足がくすぐったいよ! (My foot tickles!) (我的脚很痒!) (다리가 간지러워!) (Nhột chân quá à.)
かゆい (kayui)
Itchy
When insects, mosquito and so on bite someone, he/she is going to be itchy which is かゆい. Unlike こしょばい, when someone feels かゆい, he/she may scratch his/her body. And かゆい is one of the bad signals or symptoms of your body such as allergy.
Example

背中がかゆいなー。 (My back itches.) (我的背部发痒。) (등이 가려운데.) (Lưng ngứa ghê.)

左腕がかゆいー。 (My left arm is itchy.) (我的左臂发痒。) (왼쪽 팔이 가려워.) (Cánh tay trái của tôi bị ngứa.)
Beginner
Intermediate
Advanced


背中をかいてくれる? (Can you scratch my back?) (可以帮我抓背吗?) (등 좀 긁어줄래?) (Gãi giúp tôi cái lưng.)

蚊にさされて痒いのー。 (I’m itchy after mosquito bit.) (蚊子叮咬发痒-) (모기에 물려서 가려워.) (Muỗi cắn ngứa quá.)
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