Le crapaud ignore que sa peau est lisse (Proverbe Douala – Cameroun). – Quand on est laid, on ne se moque pas des autres.
The frog does not know that its skin is not smooth (Duala proverb – Cameroon). – When you are ugly, do not laugh at others.
Proverbe Douala sur Soi-Même / Duala Proverb on Oneself
African Heritage 
That’s a unique proverb. It sort of reminds me of the saying (in some indirect way), “If you live in a glass house, then don’t throw stones.”
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Amen! You are absolutely right!
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Thanks, Dr. Y! Yeah, the message rings true with either version of the proverb.
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