Try applying anti stretch mark creams, if you haven't been applying? I'm using Sebamed, cos I find it absorbs faster compared to Mustela and Palmer's.
I also apply Hada Labo lotion before the cream sometimes. Hydrating and moisturizing helps to reduce the itch, by improving elasticity.
It's not so magical to prevent stretch marks entirely though, if you are genetically more prone to having stretch marks.
I also use Aveeno 24H moisturizer for other parts of my body when it itches.
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