The invention relates to an application pen (10) for applying a fluid substance (S) on a body part, said application pen comprising an applicator head (12) made of a porous material (20), said applicator head comprising a first part (22) and a second part (24) inclined (α) relative to each other, said first and second parts being single-piece. The applicator head is obtainable by a method comprising the following steps: forming a rod made of the porous material, said rod extending parallel to the first axis and having a first transversal dimension; then removing a portion of porous material, by grinding, in an off-centered manner, from a segment of the rod, in order to reduce (27) the first transversal dimension of said segment, said segment including a junction (30) between the first and second parts.